Ted on the headphones, after the initial pairing they should pair up almost instantly when you turn both on. I turn my headphones first then my detector. An old habit for quick pair up with the 800. Sometimes I have to turn on the Bluetooth button, just activate, not press nd hold and they pair immediately. I think I had to fiddle around with them once or twice after a factory reset but after that pairing seems smooth. In my soil most detectors struggle to see past 8 inches unless in clean old ground. IMO the separation ability on the 900 is better than the 800 but depth goes to the 800. Two other guys in my area running 900s say the same thing. I like to run Field 2 5 tone rec. 4 Ib 0. In a trashy area I will some times raise Rec. to 6 or 7. I rarely go below 4 though, any lower elongates and distorts the "coin tone " signal I listen for. You might try all metal with Vol. down a 2 just to listen for the blips. Change directions. Then again the area you hunt could have very few targets left. Do you use 5 tone or all tones ? Do you still have an 800 ? Good luck. Mark